Thematische Bibliographien / Near field magnetic enhancement

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Auswahl der wissenschaftlichen Literatur zum Thema „Near field magnetic enhancement“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 9. Februar 2022

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Zeitschriftenartikel zum Thema "Near field magnetic enhancement"

Liberal, Iñigo, Yue Li und Nader Engheta. „Magnetic field concentration assisted by epsilon-near-zero media“. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 375, Nr. 2090 (28.03.2017): 20160059. http://dx.doi.org/10.1098/rsta.2016.0059.

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Strengthening the magnetic response of matter at optical frequencies is of fundamental interest, as it provides additional information in spectroscopy, as well as alternative mechanisms to manipulate light at the nanoscale. Here, we demonstrate theoretically that epsilon-near-zero (ENZ) media can enhance the magnetic field concentration capabilities of dielectric resonators. We demonstrate that the magnetic field enhancement factor is unbounded in theory, and it diverges as the size of the ENZ host increases. In practice, the maximal enhancement factor is limited by dissipation losses in the host, and it is found via numerical simulations that ENZ hosts with moderate losses can enhance the performance of a circular dielectric rod resonator by around one order of magnitude. The physical mechanism behind this process is the strongly inhomogeneous magnetic field distributions induced by ENZ media in neighbouring dielectrics. We show that this is an intrinsic property of ENZ media, and that the occurrence of resonant enhancement is independent of the shape of the host. These results might find applications in spectroscopy, in sensing, in light emission and, in general, in investigating light–matter interactions beyond electric dipole transitions. This article is part of the themed issue ‘New horizons for nanophotonics’.

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Leitão, D. C., I. G. Trindade, R. Fermento, João P. Araújo, S. Cardoso, P. P. Freitas und João Bessa Sousa. „Magnetic Field Enhancement with Soft Magnetic Flux Guides“. Materials Science Forum 587-588 (Juni 2008): 313–17. http://dx.doi.org/10.4028/www.scientific.net/msf.587-588.313.

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In this work, a study of the sensitivity enhancement of spin valve sensors, when located in close proximity to magnetic flux guides, is presented. The magnetoresistance (MR) of spin-valve sensors, lithographically patterned into stripes with lateral dimensions, (length) l = 500 µm, (width) wsensor = 1, 2, 6 µm and placed near one/two Co93.5Zr2.8Nb3.7 (CZN) magnetic flux guide, is characterized at room temperature. CZN has a high permeability that together with a defined microstructured shape, is able to concentrate the magnetic flux in a small area, leading to an increase in sensor's sensitivity. The magnetic field amplification is estimated by comparison of sensor sensitivity with/without magnetic flux guides, in the linear operation range, and studied as a function of different parameters. Besides an enhancement in sensitivity, sensors also exhibit an important increase in the hard axis coercivity and a shift from MR(H=0) = 0.5, both attributed to the magnetic flux guides. Amplification factors of the order of 20 are observed..

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Sanz-Fernández, Juan José. „Near-field enhancement for infrared sensor applications“. Journal of Nanophotonics 5, Nr. 1 (01.01.2011): 051814. http://dx.doi.org/10.1117/1.3604785.

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Sun, T. R., C. Wang, N. L. Borodkova und G. N. Zastenker. „Geosynchronous magnetic field responses to fast solar wind dynamic pressure enhancements: MHD field model“. Annales Geophysicae 30, Nr. 8 (27.08.2012): 1285–95. http://dx.doi.org/10.5194/angeo-30-1285-2012.

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Abstract. We performed global MHD simulations of the geosynchronous magnetic field in response to fast solar wind dynamic pressure (Pd) enhancements. Taking three Pd enhancement events in 2000 as examples, we found that the main features of the total field B and the dominant component Bz can be efficiently predicted by the MHD model. The predicted B and Bz varies with local time, with the highest level near noon and a slightly lower level around mid-night. However, it is more challenging to accurately predict the responses of the smaller component at the geosynchronous orbit (i.e., Bx and By). In contrast, the limitations of T01 model in predicting responses to fast Pd enhancements are presented.

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Bohn, John L., D. J. Nesbitt und A. Gallagher. „Field enhancement in apertureless near-field scanning optical microscopy“. Journal of the Optical Society of America A 18, Nr. 12 (01.12.2001): 2998. http://dx.doi.org/10.1364/josaa.18.002998.

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Lee, Jaejoon, und Jaewook Lee. „Magnetic Force Enhancement Using Air-Gap Magnetic Field Manipulation by Optimized Coil Currents“. Applied Sciences 10, Nr. 1 (21.12.2019): 104. http://dx.doi.org/10.3390/app10010104.

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This paper presents an air-gap magnetic field manipulation by optimized coil currents for a magnetic force enhancement in electromechanical devices. The external coil is designed near the device air-gap for manipulating the magnetic field distribution. The distribution of external coil currents is then optimized for maximizing the magnetic force in the tangential direction to the air-gap line. For the optimization, the design domain near air-gap is divided into small areas, and design variables are assigned at each small design area. The design variables determines not only the strength of coil current density (i.e., number of coil turns) but also whether the material state is coil or iron. In a benchmark actuator example, it is shown that 11.12% force enhancement is available by manipulating the air-gap magnetic field distribution using the optimized coil current. By investigating the magnetic field distribution, it is confirmed that the optimized coil current manipulated the magnetic field, forwarding a focused and inclined distribution that is an ideal distribution for maximizing the magnetic force.

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Furukawa, Hiromitsu, und Satoshi Kawata. „Local field enhancement with an apertureless near-field-microscope probe“. Optics Communications 148, Nr. 4-6 (März 1998): 221–24. http://dx.doi.org/10.1016/s0030-4018(97)00687-1.

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Encina, Ezequiel R., und Eduardo A. Coronado. „Near Field Enhancement in Ag Au Nanospheres Heterodimers“. Journal of Physical Chemistry C 115, Nr. 32 (22.07.2011): 15908–14. http://dx.doi.org/10.1021/jp205158w.

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Granitzka, Patrick W., Emmanuelle Jal, Loïc Le Guyader, Matteo Savoini, Daniel J. Higley, Tianmin Liu, Zhao Chen et al. „Magnetic Switching in Granular FePt Layers Promoted by Near-Field Laser Enhancement“. Nano Letters 17, Nr. 4 (17.03.2017): 2426–32. http://dx.doi.org/10.1021/acs.nanolett.7b00052.

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Aksyuk, Vladimir, Basudev Lahiri, Glenn Holland und Andrea Centrone. „Near-field asymmetries in plasmonic resonators“. Nanoscale 7, Nr. 8 (2015): 3634–44. http://dx.doi.org/10.1039/c4nr06755j.

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Dissertationen zum Thema "Near field magnetic enhancement"

Beneš, Adam. „Plazmonické antény pro vysoké vlnové délky“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443226.

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Tato diplomová práce se zabývá vlastnostmi plazmonických antén v oblasti vysokých vlnových délek. Důraz je kladen na popis rezonančních vlastností jednotlivých antén i antén uspořádaných do periodických polí. Těžiště práce spočívá v počítačovém modelování navýšení magnetického pole v blízkosti antén, které lze využít ve vysokofrekvenční elektronové paramagnetické rezonanci (HFEPR) k zesílení měřeného signálu. Autor se zabývá kvantifikací zesílení v anténách s odlišnou geometrií a navrhuje i geometrii vlastní. Značná část práce se také věnuje snaze rozlišit příspěvky k navýšení magnetického pole od různých zdrojů při měření HFEPR v uspořádání s dvojitou transmisí záření.

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Sulaiman, Ali Haidar. „The near-Saturn magnetic field environment“. Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/44209.

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Shock waves exist throughout the universe and are fundamental to understanding the nature of collisionless plasmas. The complex coupling between charged particles and electromagnetic fields in plasmas give rise to a whole host of mechanisms for dissipation and heating across shock waves, particularly at high Mach numbers. While ongoing studies have investigated these process extensively both theoretically and via simulations, their observations remain few and far between. This thesis presents a study of very high Mach number shocks in a parameter space that has been poorly explored and identifies reformation using in situ magnetic field observations from the Cassini spacecraft at Saturn's bow shock. This gives an insight into quasi-perpendicular shocks across two orders of magnitude in Alfvén Mach number (MA) and spanning Earth-like to Astrophysical-like regimes. The work here shows evidence for cyclic reformation controlled by specular ion reflection occurring at the predicted timescale of ~0.3 τc, where τc is the ion gyroperiod. The relationship between these reformation signatures, magnetic overshoot and variability are also presented. The final part of this thesis characterises the region downstream of Saturn's bow shock, the magnetosheath. The results show a comprehensive overview of the configuration of the magnetic field in a non-axisymmetric magnetosheath. This non-axisymmetry is revealed to have an impact in the rotation of the magnetic field and is significant enough to influence the magnetic shear at the magnetopause.

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Séguin, Guy. „Enhancement of efficiency and accuracy of near-field measurements“. Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=35612.

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This thesis examines the possibility of increasing the speed of Near-Field measurement of an Antenna, by reducing the number of measurement points and by determining the degree of truncation permissible while maintaining a prescribed degree of precision of the reconstructed far-field.
The mathematical formulation leading to the near-field to far-field transform is presented in a novel and simpler form to use. Relations are established between the selected area and sampling rate of Near-Field measurement and the accuracy of the Far-Field of an Antenna. The spectral domain of the field is analysed in each case and parametric curves are derived. Correction of the spectral domain can significantly improve the accuracy of the Far-Field while using the same amount of Near-Field data.
A new concept, described as the Signature Function, is presented, analysed and tested. This new concept offers the possibility of conducting a highly reduced set of measurements while producing accurate results for antennas whose "Signature Function" is previously determined or can be estimated.
The simulated Near-Field of a radiating array is analysed in depth. A formulation and a procedure to correct the spectral domain of the field are established.
The technique developed is applied to experimental and simulated Near-Field data of large radiating Antennas leading to new information about the accuracy and speed of measurement achievable.

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Seguin, Guy. „Enhancement of efficiency and accuracy of near-field measurements“. Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0018/NQ44576.pdf.

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Fischer, Janina [Verfasser]. „Near-field mediated enhancement effects on plasmonic nanostructures / Janina Fischer“. Mainz : Universitätsbibliothek Mainz, 2012. http://d-nb.info/1019193654/34.

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Hearn, Christian Windsor. „Electrically-Small Antenna Performance Enhancement for Near-Field Detuning Environments“. Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/49554.

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Bandwidth enhancement of low-profile omnidirectional, electrically-small antennas has evolved from the design and construction of AM transmitter towers eighty years ago to current market demand for battery-powered personal communication devices. Electrically-small antenna theory developed with well-known approximations for characterizing radiation properties of antenna structures that are fractions of the radiansphere. Current state-of-the-art wideband small antennas near kaH1 have achieved multiple-octave impedance bandwidths when utilizing volume-efficient designs.
Significant advances in both the power and miniaturization of microelectronics have created a second possible approach to enhance bandwidth. Frequency agility, via switch tuning of reconfigurable structures, offers the possibility of the direct integration of high-speed electronics to the antenna structure. The potential result would provide a means to translate a narrow instantaneous bandwidth across a wider operating bandwidth.
One objective of the research was to create a direct comparison of the passive- multi-resonant and active-reconfigurable approaches to enhance bandwidth. Typically, volume-efficient, wideband antennas are unattractive candidates for low-profile applications and conversely, active electronics integrated directly antenna elements continue to introduce problematic loss mechanisms at the proof-of-concept level.
The dissertation presents an analysis method for wide bandwidth self-resonant antennas that exist in the 0.5dkad1.0 range. The combined approach utilizes the quality factor extracted directly from impedance response data in addition to near-and-far field modal analyses. Examples from several classes of antennas investigated are presented with practical boundary conditions. The resultant radiation properties of these antenna-finite ground plane systems are characterized by an appreciable percentage of radiated power outside the lowest-order mode.
Volume-efficient structures and non-omnidirectional radiation characteristics are generally not viable for portable devices. Several examples of passive structures, representing different antenna classes are investigated. A PIN diode, switch-tuned low-profile antenna prototype was also developed for the comparison which demonstrated excessive loss in the physical prototype.
Lastly, a passive, low-profile multi-resonant antenna element with monopole radiation is introduced. The structure is an extension of the planar inverted-F antenna with the addition of a capacitance-coupled parasitic to enhance reliable operation in unknown environments.

Ph. D.

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Went, Daniel Robert. „Magnetic field and plasma in Saturn's near space environment“. Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/9066.

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This thesis concerns spacecraft observations of magnetic field and plasma in Saturn’s near space environment and compares these observations with those made in and near the Jovian magnetosphere. Such comparisons are equivalent to ‘turning the experimental dial’ in planetary magnetospheres and provide a valuable insight into the way different parameters govern the structure and dynamics of magnetospheres throughout the solar system. Saturn and its magnetosphere is currently being studied by the Cassini spacecraft which, arriving at Saturn in the summer of 2004, became the first spacecraft ever to enter orbit around the planet. As a result there has never been a better time to study the Saturn system and the vast majority of the data utilized in this thesis were obtained by the Cassini spacecraft and its onboard instrumentation. Additional data were also obtained from the Pioneer, Voyager, Ulysses and Galileo spacecraft. Chapter 1 provides a general overview of space plasma and magnetospheric physics while Chapter 2 discusses the Saturn system in more detail. Chapter 3 describes the spacecraft and instrumentation used in this thesis with particular emphasis placed on magnetometer instruments and the Cassini-Huygens spacecraft. Chapter 4 compares the structure of Jupiter’s and Saturn’s outer magnetospheres and discusses the similarities and differences between the two. Chapter 5 presents a new empirical model of Saturn’s dayside bow shock and discusses the three dimensional shape of this surface while, finally, Chapter 6 presents observations of a magnetic cavity in the Saturnian magnetosphere which, as of writing, has yet to be explained. Chapter 7 summarises and concludes the thesis. The three independent investigations described above each shed light on a different aspect of Saturn’s magnetospheric structure and dynamics and contributes to an improved understanding of magnetospheric physics in general.

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Arkeholt, Simon. „Induction in Printed Circuit Boards using Magnetic Near-Field Transmissions“. Thesis, Linköpings universitet, Teoretisk Fysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-148788.

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In 1865 Maxwell outlined the theoretical framework for electromagnetic field propagation. Since then many important developments have been made in the field, with an emphasis on systems using high frequencies for long-range interactions. It was not until recent years that applications based on short-range inductive coupling demonstrated the advantages of using low frequency transmissions with magnetic fields to transfer power and information. This thesis investigates magnetic transmissions in the near-field and the possibility of producing induced voltages in printed circuit boards. A near-field magnetic induction system is designed to generate a magnetic flux in the very low frequency region, and used experimentally to evaluate circuit board induction in several interesting environments. The resulting voltages are measured with digital signal processing techniques, using Welch’s method to estimate the spectrum of the received voltage signal. The results show that the amount of induced voltage is proportional to the inverse cube of the transmission distance, and that the system is able to achieve a maximum induced voltage of 65 \micro V at a distance of 2.5 m and under line-of-sight conditions. It is also concluded that conductive obstructions, electromagnetic shielding and background noise all have a large impact on the obtained voltage, either cancelling the signal or causing it to fluctuate.

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Bocan, Jiri. „Sensitivity enhancement and field-dependent relaxation in singlet nuclear magnetic resonance“. Thesis, University of Southampton, 2013. https://eprints.soton.ac.uk/354550/.

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Nitrous oxide (N2O), also known as "laughing" gas, is a well known compound used in medicine as a mild anaesthetic, or in engineering as a powerful oxidizer providing highoutput of engines. Recently, its 15N doubly-labelled isotopologue attracted attention in singlet NMR due to its long singlet relaxation time ranging between 7 minutes, when dissolved in blood, up to 26 minutes in degassed dimethyl sulfoxide (DMSO). Singlet NMR deals with nuclear singlet states, which are exchange antisymmetric quantum states of coupled pairs of spin-1/2 nuclei with zero total nuclear spin quantum number. These states are nonmagnetic and immune to exchange-symmetric relaxation processes such as intramolecular direct dipolar relaxation. Their lifetimes may be up to an order of magnitude longer than conventional relaxation times T1 and T2. Besides various fields of NMR, singlet states find potential application also in MRI. The direct medical application of 15N2O as a MRI tracer is, however, complicated by a poor detection sensitivity resulting from the low 15N magnetogyric ratio, low solubility in liquids at room temperature and atmospheric pressure, and limitations of 15N signal enhancement by means of physical methods for dissolved 15N2O. This thesis addresses two topics related to singlet NMR of 15N2O { sensitivity enhancement and magnetic-field dependent relaxation. The NMR signal decay in liquid phase is often dominated by static magnetic �eld inhomogeneity, described by the time constantT�2 , which is much faster than the transverse relaxation, characterized by T2. Repeated refocusing by a multiple spin-echo (MSE) train maintains the 15N signal for extended times of several T2. Acquisition of the signal during the whole MSE sequence followed by a proper processing either by matched weighting or singular value decomposition, may lead to the signal-to noise ratio (SNR) enhancement by up to an order of magnitude under favourable circumstances. The SNR enhancement is a function of T2, T� 2, and the spectral resolution. The procedure of the SNR enhancement in combination with methods of singlet NMR was used to investigate in detail low-field 15N2O singlet relaxation. The 15N2O relaxation measurements were extended to field strengths up to the spectrometer high field. The observed relaxation dependencies were described by a general theory, relaxation as a time-dependent exchange of populations of the �eld-dependent energy eigenstates. In particular, spin-rotation relaxation in low field was discussed.

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Shu, Qingying. „Statistical modelling of the near-Earth magnetic field in space weather“. Thesis, University of Glasgow, 2018. http://theses.gla.ac.uk/8937/.

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Space weather refers to electromagnetic disturbances in the near-Earth environment as a result of the Sun-Earth interaction. Severe space weather events such as magnetic storms can cause disruption to a wide range of technologies and infrastructure, including communications systems, electronic circuits and power grids. Because of its high potential impact, space weather has been included in the UK National Risk Register since 2011. Space weather monitoring and early magnetic storm detection can be used to mitigate risk in sensitive technological systems. The aim of this project is to investigate the electromagnetic disturbances in the near-Earth environment through developing statistical models that quantifies the variations and uncertainties in the near-Earth magnetic field. Data of the near-Earth magnetic field arise from in-situ satellite measurements and computer model outputs. The Cluster II mission (Escoubet et al., 2001a) has four satellites that provide in-situ measurements of the near-Earth magnetic field at time-varying locations along their trajectories. The computer model consists of an internal part that calculates the magnetic field sourced from Earth itself and an external part that estimates the magnetic field resulting from the Sun-Earth interaction. These magnetic fields, termed as the internal field and the external field, add up to the total magnetic field. Numerical estimates of the internal field and the external field are obtained respectively from the IGRF-11 model (Finlay et al., 2010) and the Tysganenko-96 (T96) model (Tsyganenko, 2013) given the times and the locations as inputs. The IGRF model outputs are invariant to space weather conditions whereas the T96 model outputs change with the input space weather parameters. The time-varying space weather parameters for T96 model include the solar wind ram pressure, the y and the z-components of the interplanetary magnetic field, and the disturbance storm time index. These parameters are the estimated time series of the solar wind conditions at the magnetopause, i.e. the boundary of the magnetosphere on the day-side, and the disturbance level at the Earth’s surface. Real-time values of the T96 model input parameters are available at hourly resolution from https://omniweb.gsfc.nasa.gov/. The overall aim of the thesis is to build spatio-temporal models that can be used to understand uncertainties and constraints leveraged from 3D mathematical models of space weather events. These spatio-temporal models can be then used to help understand the design parameters that need to be varied in building a precise and reliable sensor network. Chapter 1 provides an introduction to space weather in terms of the near-Earth magnetic field environment. Beginning with an overview of the near-Earth magnetic field environment, Chapter 2 describes the sources for generating in-situ satellite measurements and computer model outputs, namely the Cluster II mission, the IGRF model, and the T96 model. The process of sampling the magnetic field data from the different data sources and the space-time dependence in the hourly sampled magnetic field data are also included in this Chapter. Converting the space-time structure in the magnetic field data into a time series structure with a function relating the position in space to time, Chapter 3 explores the temporal variations in the sampled in-situ satellite measurements. Through a hierarchical approach, the satellite measurements are related to the computer model outputs. This chapter proposes statistical methods for dealing with the non-stationary features, temporal autocorrelation, and volatility present in the time series data. With the aim of better characterising the electromagnetic environment around the Earth, Chapter 4 develops time-series models of the near-Earth magnetic field utilising in-situ (CLUSTER) magnetic field data. Regression models linking the CLUSTER satellite observations and two physical models of the magnetic field (T96 and IGRF) are fit to each orbit in the period 2003-2013. The time series of model parameter estimates are then analysed to examine any long term patterns, variations and associations to storm indices. In addition to explaining how the two physical models calibrate with the observed satellite measurements, these statistical models capture the inherent volatility in the magnetic field, and allow us to identify other factors associated with the magnetic field variation, such as the relative position of each satellite relative to the Earth and the Sun. Mixed-effect models that include these factors are constructed for parameters estimated from the regression models for evaluating the performance of the two computer models. Following the calibration of the computer models against the satellite measurements, Chapter 5 investigates how these computer models allow us to investigate the association between the variations in near-Earth magnetic field and storms. To identify the signatures of storm onsets in different locations in the magnetosphere, change-point detection methods are considered for time series magnetic field signals generated from the computer models along various feasible satellite orbits. The detection results inform on potential sampling strategies of the near-Earth magnetic field to be predictive of storms through selecting achievable satellite orbits for placing satellite sensors and detecting changes in the time series magnetic signals. Chapter 6 provides of a summary of the main finding within this thesis, identifies some limitations of the work carried out in the main chapters, and include a discussion of future research. An Appendix provides details of coordinate transformation for converting the time and position dependent magnetic field data into an appropriate coordinate system.

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Bücher zum Thema "Near field magnetic enhancement"

Sulaiman, Ali Haidar. The Near-Saturn Magnetic Field Environment. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-49292-6.

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Hill, David A. Near-field and far-field excitation of a long conductor in a lossy medium. Boulder, Colo: Electromagnetic Fields Division, Center for Electronics and Electrical Engineering, National Engineering Laboratory, National Institute of Standards and Technology, 1990.

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Denkova, Denitza. Optical Characterization of Plasmonic Nanostructures: Near-Field Imaging of the Magnetic Field of Light. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-28793-5.

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Sulaiman, Ali Haidar. The Near-Saturn Magnetic Field Environment. Springer, 2018.

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Sulaiman, Ali Haidar. The Near-Saturn Magnetic Field Environment. Springer, 2016.

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1966-, Kawata Satoshi, und Shalaev Vladimir M. 1957-, Hrsg. Tip enhancement. Amsterdam: Elsevier, 2007.

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Buchteile zum Thema "Near field magnetic enhancement"

Bielefeldt, H., B. Hecht, S. Herminghaus, J. Mlynek und O. Marti. „Direct Measurement of the Field Enhancement Caused by Surface Plasmons with the Scanning Tunneling Optical Microscope“. In Near Field Optics, 281–86. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1978-8_31.

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Lühr, Hermann, Chao Xiong, Nils Olsen und Guan Le. „Near-Earth Magnetic Field Effects of Large-Scale Magnetospheric Currents“. In Earth's Magnetic Field, 529–53. Dordrecht: Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1225-3_18.

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Silva, T. J., und S. Schultz. „Development of a Scanned Near-Field Optical Microscope for Magneto-Optic Kerr Imaging of Magnetic Domains with 10 nm Resolution“. In Near Field Optics, 263–72. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1978-8_29.

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Benson, Heather A. E., Matthew McIldowie und Tarl Prow. „Magnetophoresis: Skin Penetration Enhancement by a Magnetic Field“. In Percutaneous Penetration Enhancers Physical Methods in Penetration Enhancement, 195–206. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-53273-7_12.

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Reich, Wolfgang. „The Large-Scale Magnetic Field Structure near the Galactic Centre“. In Galactic and Intergalactic Magnetic Fields, 369–72. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0569-6_116.

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Lohr, D. A., L. J. Zanetti, B. J. Anderson, T. A. Potemra, J. R. Hayes, R. E. Gold, R. M. Henshaw et al. „Near Magnetic Field Investigation, Instrumentation, Spacecraft Magnetics and Data Access“. In The Near Earth Asteroid Rendezvous Mission, 255–81. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5200-6_6.

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Karunanayaka, Kasun, Sanath Siriwardana, Chamari Edirisinghe, Ryohei Nakatsu und Ponnampalam Gopalakrishnakone. „Magnetic Field Based Near Surface Haptic and Pointing Interface“. In Human-Computer Interaction. Interaction Modalities and Techniques, 601–9. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-39330-3_65.

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Denkova, Denitza. „Magnetic Near-Field Imaging of Increasingly Complex Plasmonic Antennas“. In Springer Theses, 63–79. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-28793-5_4.

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Rempt, Raymond D. „Fiber Optic Sensing of Magnetic Field Gradients in Near and Far Field“. In Applications of Fiber Optic Sensors in Engineering Mechanics, 266–78. New York, NY: American Society of Civil Engineers, 1993. http://dx.doi.org/10.1061/9780872628953.ch18.

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Reif, K. „The Radio Continuum Brightness Minimum near Polaris: A Hole in the Interstellar Magnetic Field?“ In Interstellar Magnetic Fields, 119–22. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-72621-7_22.

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Konferenzberichte zum Thema "Near field magnetic enhancement"

Karmakar, Subhajit, R. K. Varshney und Dibakar Roy Chowdhury. „Magnetic Near-Field Enhancement in THz Multilayer Fano Metamaterial“. In 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC). IEEE, 2019. http://dx.doi.org/10.1109/cleoe-eqec.2019.8873112.

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Lim, Dong-Soo, und Young-Joo Kim. „Enhancement of Near-Field Optical Throughput using Double Grating Structure for HAMR Head“. In 2006 Asia-Pacific Magnetic Recording Conference. IEEE, 2006. http://dx.doi.org/10.1109/apmrc.2006.365960.

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Czapla, Braden, Yi Zheng, Karthik Sasihithlu und Arvind Narayanaswamy. „Non-Surface Polaritonic Peaks in Near-Field Radiative Transfer“. In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-37192.

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Near-field effects in radiative transfer refer to the collective influence of interference, diffraction, and tunneling of electro-magnetic waves on energy transfer between two or more objects. Most studies of near-field radiative transfer have so far focused on the enhancement due to tunneling of surface polaritons. In this work, we show the existence of sharp peaks in the radiative transfer spectrum between two spheres of polar materials that are not due to surface polaritons. The peaks, which are present on either side of the restrahlen band, are because of Mie resonances.

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Huang, C. H., C. Y. Lin und S. J. Chen. „Study the enhancement of near electro-magnetic field via plasmonic effects using finite-difference time-domain method and near-field scanning optical microscopy“. In SPIE Optics + Photonics, herausgegeben von Mark I. Stockman. SPIE, 2006. http://dx.doi.org/10.1117/12.682119.

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Lin, C. Y., F. C. Chien, C. H. Huang und S. J. Chen. „A theoretical and experimental investigation into the enhancement of near electro-magnetic field via plasmonic effects“. In Biomedical Optics 2006, herausgegeben von Tuan Vo-Dinh, Joseph R. Lakowicz und Zygmunt Gryczynski. SPIE, 2006. http://dx.doi.org/10.1117/12.647452.

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Lee, Taeseung, Jong Hyuk Lee und Yong Hoon Jeong. „Pool Boiling and Flow Boiling CHF Enhancement at Atmospheric Pressure Using Magnetic Nanofluid“. In 2012 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/icone20-power2012-55094.

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In this study, we suggest a new working fluid: magnetic nanofluid, or magnetite-water nanofluid, which is a colloidal suspension of magnetite nanoparticles in the pure water. By using the nanofluid, we can expect the critical heat flux (CHF) enhancement, and also for the magnetic nanofluid. Since the magnetite nanoparticles can be controlled by an external magnetic field, the magnetic nanofluid is regarded as a controllable nanofluid, and thus, we can expect the advantages of magnetic nanofluid: 1) the nanoparticle suspension in nanofluid can be maintained by applying the alternating magnetic field, 2) the nanofluid concentration can be localized by applying the magnetic field for a region of interest and 3) the magnetite nanoparticles can be removed from magnetic nanofluid easily. In this study, we focused on the CHF characteristics of magnetic nanofluid in both pool boiling and flow boiling. The first part is for the pool boiling CHF of magnetic nanofluid. At atmospheric pressure, saturated pool boiling CHF experiments were conducted using Ni-Cr wire for magnetic nanofluid and the other nanofluids. Among the various nanofluids, magnetic nanofluid has the highest value of pool boiling CHF, and the enhancement ratio (with respect to the pure water) ranges from 170 to 240 percent. To elucidate the mechanism underlying the pool boiling CHF enhancement, three approaches were introduced: 1) scanning electron microscope (SEM) images were obtained to explain the pool boiling CHF enhancement mechanism due to the deposited nanoparticles, which is related to the surface wettability of the heat transfer surface, 2) ultra-high speed movie were taken and analyzed to observe the bubble dynamics at the heat transfer surface and 3) the strength of electricity-induced magnetic field neat the heat transfer surface were calculated to examine the effect of magnetic field on the pool boiling CHF. The second part is for the flow boiling CHF of magnetic nanofluid. A series of flow boiling CHF experiments were performed at atmospheric pressure and low mass flux conditions. Based on the experimental data, we conclude that the use of magnetic nanofluid improves the flow boiling CHF characteristics: the flow boiling CHF enhanced for the magnetic nanofluid. This is mainly due to the deposition of magnetite nanoparticles on the heat transfer surface, which results in the improvement of wettability and re-wetting characteristics. And we need enough time to ensure the nanoparticle deposition and the flow boiling CHF enhancement, when a nanofluid is used as a working fluid.

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Go, David B., Timothy S. Fisher und Suresh V. Garimella. „Direct Simulation Monte Carlo Analysis of Microscale Field Emission and Ionization of Atmospheric Air“. In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14476.

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Ionic winds are formed when air ions are drawn through the atmosphere by applied electric and/or magnetic fields. The ions collide with neutral air molecules, exchanging momentum, causing the neutral molecules to move. Continued collisions and momentum exchanges generate a net flow called an ionic wind [1]. Ionic winds formed near flat plates can produce local boundary layer distortion in the presence of a bulk flow. This concept has been studied experimentally at the macroscale as a method for drag reduction [2] and has been suggested at the microscale for convective cooling enhancement [3]. Specifically, microfabricated ion wind engines can be integrated onto electronic chips to provide additional local cooling at "hot-spot" locations. In our previous work, continuum modeling of the ionic wind phenomena showed an approximately 50% increase in the local heat transfer coefficient at the location of the ion wind engine [3]. However, in that work, ionization physics were not modeled, rather assumptions for ion current and concentrations were used as a basis for modeling ion transport. At the microscale, ionization occurs when field-emitted electrons from closely spaced electrodes collide with neutral air molecules, stripping away electrons and forming molecular ions. Geometric enhancement of the electrodes using nanostructured materials enables low ionization voltages conducive to microelectronic devices. Understanding the microscale ionization process is necessary to accurately predict the ensuing ionic wind and cooling. Direct Simulation Monte Carlo (DSMC) is used in the present work to predict field emission between two planar electrodes and the consequent ionization of the interstitial air.

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Yuksel, Anil, Michael Cullinan und Jayathi Murthy. „Polarization Effect on Out of Plane Configured Nanoparticle Packing“. In ASME 2017 12th International Manufacturing Science and Engineering Conference collocated with the JSME/ASME 2017 6th International Conference on Materials and Processing. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/msec2017-3075.

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Surface plasmon polaritons are associated with the light-nanoparticle interaction and results in high enhancement in the gap between the particles. Indeed, this is affected by particle size, spacing, interlayer distance and light source properties. Polarization effect on three-dimensional (3D) and out of plane nanoparticle packings are presented herein to understand the out of plane configuration effect by using 532 nm plane wave light. This analysis gives insight on the particle interactions between the adjacent layers for multilayer nanoparticle packings. It has been seen that the electric field enhancement is up to 400 folds for TM (Transverse magnetic) or X-polarized light and 26 folds for TE (Transverse electric) or Y-polarized light. Thermo-optical properties change nonlinearly between 0 and 10 nm gap spacing due to the strong and non-local near-field interaction between the particles for the TM polarized light; however, this is linear for TE polarized light. This will give insight on the micro/nano heat transport for the interlayer particles for 100 nm diameter of Cu nanoparticle packings under 532 nm light under different polarization for 3-D interconnect (IC) manufacturing.

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Adam, A. J. L., J. Brok, A. S. van de Nes und P. C. M. Planken. „Terahertz near-field measurements of field enhancement near metal objects“. In >2006 Joint 31st International Conference on Infrared Millimeter Waves and 14th International Conference on Teraherz Electronics. IEEE, 2006. http://dx.doi.org/10.1109/icimw.2006.368224.

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Miyanishi, S., N. lketani, K. Takayama, K. Innami, I. Suzuki, T. Kitazawa, Y. Ogimoto, Y. Murakami, K. Kojima und A. Takahashi. „Near field assisted magnetic recording“. In INTERMAG Asia 2005: Digest of the IEEE International Magnetics Conference. IEEE, 2005. http://dx.doi.org/10.1109/intmag.2005.1463443.

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Berichte der Organisationen zum Thema "Near field magnetic enhancement"

I.Y. Dodin und N.J. Fisch. Motion of Charged Particles near Magnetic Field Discontinuities. Office of Scientific and Technical Information (OSTI), November 2000. http://dx.doi.org/10.2172/768663.

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Brooks, J. N. Near-surface sputtered particle transport for an oblique incidence magnetic field plasma. Office of Scientific and Technical Information (OSTI), November 1989. http://dx.doi.org/10.2172/5343157.

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Tedrow, P. M., und R. Meservey. Improvement in high magnetic field behavior of vandium gallium superconductors by enhancement of spin-orbit scattering. Office of Scientific and Technical Information (OSTI), November 1988. http://dx.doi.org/10.2172/5059318.

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Harff, N. E., J. A. Simmons, S. K. Lyo, J. F. Klem und S. M. Goodnick. Giant effective mass deviations near the magnetic field-induced minigap in double quantum wells. Office of Scientific and Technical Information (OSTI), September 1994. http://dx.doi.org/10.2172/10184138.

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Samuel A. Cohen und Alan H. Glasser. Ion heating in the field-reversed configuration (FRC) by rotating magnetic fields (RMF) near cyclotron resonance. Office of Scientific and Technical Information (OSTI), Juli 2000. http://dx.doi.org/10.2172/758642.

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Walker, J. S. Liquid-metal flow in a thin conducting pipe near the end of a region of uniform magnetic field. Office of Scientific and Technical Information (OSTI), April 1986. http://dx.doi.org/10.2172/5309286.

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Burns, L. E. Total field magnetics of selected areas near Ketchikan, southeastern Alaska, Map B - north, Prince of Wales Island (magnetic contours included). Alaska Division of Geological & Geophysical Surveys, 1999. http://dx.doi.org/10.14509/303.

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Burns, L. E. Total field magnetics of selected areas near Ketchikan, southeastern Alaska, Map C - south, Prince of Wales Island (magnetic contours included). Alaska Division of Geological & Geophysical Surveys, 1999. http://dx.doi.org/10.14509/304.

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Burns, L. E. Total field magnetics of selected areas near Ketchikan, southeastern Alaska, Map D - western and eastern parts, Gravina Island (magnetic contours included). Alaska Division of Geological & Geophysical Surveys, 1999. http://dx.doi.org/10.14509/305.

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Burns, L. E. Total field magnetics of selected areas near Ketchikan, southeastern Alaska, Map A - Salt Chuck and Kasaan Peninsula, Prince of Wales Island (magnetic contours included). Alaska Division of Geological & Geophysical Surveys, 1999. http://dx.doi.org/10.14509/302.

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